Page: 89
Service Guide ML390/391
Chapter 4 Failure & Repair Analysis
RAP 03: Wrong or Missing Characters / Dots on Output
START
Is the head cable correctly inserted into CN2 of the control board?
NO Correctly insert the cable.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
YES Is the head cable correctly inserted into CN1 of the connection board?
NO Correctly insert the cable.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
YES Go to the next step listed below.
YES Replace the printhead.
Is the problem resolved?
YES End of procedure.
NO Replace the control board.
Is the problem resolved?
YES End of procedure.
NO Go to A.
A
Are the contacts between the space motor and the carriage cable properly made?
YES Replace the space motor.
Is the problem resolved?
YES End of procedure.
NO Go to the next step listed below.
NO Reseat the carriage cable and the space motor assembly.
Is the problem resolved?
YES End of procedure.
NO Contact Technical Support.
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